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Article No.
03-5-6

03/17/03

CLIMATE CONTROL - MUSTY OR MILDEW TYPE
ODOR FROM CLIMATE CONTROL SYSTEM

FORD:
2001-2003 ESCAPE

ISSUE
Some vehicles may exhibit a musty and/or mildew type odor coming from the climate control system. This odor is caused by mildew-type fungi growth in the A/C evaporator. It is most noticeable when the A/C is first turned on.

ACTION
Apply Motorcraft A/C Cooling Coil Coating to the A/C system, which encapsulates the mildew to help reduce odors. Install air inlet vacuum motor bleed valve, which operates the recirculation/fresh air door to default to fresh mode when the vehicle is parked to dry out the evaporator core. Refer to the following Service Procedure for details.

OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage

OPERATION: 030506A
DESCRIPTION: Apply Motorcraft A/C Cooling Coil Coating To The A/C System Then Install Air Inlet Vacuum Motor Bleed Valve
TIME: 1.5 Hrs.

DEALER CODING
BASIC PART NO.:19B55
CONDITION CODE: 53

OASIS CODES: 208000, 208300, 208999

Types Of Odors, Their Sources And Treatments
There are typically four (4) types of objectionable odors found in a vehicle, they are:
^ Chemical odors
^ Environmental odors
^ Microbiological odors
^ Human and other interior-generated odors

Odors can be described in a number of ways:
^ Musty
^ Mildew
^ Fishy
^ Sweet
^ Burning
^ Chemical
^ Fuel
^ Oil
^ Exhaust
^ Wet cement
^ Urine
^ Tar
^ Fragrance
^ Body odor

Chemical odors:
^ Coolant: sweet smell
^ Fuel: gasoline or diesel fuel smell
^ Oil: oil type or burning smell
^ Power Steering Fluid: oil type or burning smell
^ Transmission Fluid: oil type or burning smell
^ Washer Fluid: alcohol type smell
^ Gear Lube: garlic/sulphur smell
^ Refrigerant/Oil: ether type smell
^ Carpet/Trim Adhesives: fishy, urine, or sweet smell
^ Evaporator Core Coating: wet cement type smell

Environmental odors:
^ Exhaust: exhaust, fuel, burning type smell
^ Industrial Pollutants: all types of smells
^ Dust: musty, mildew, wet cement type smell
^ Pollen: sweet smell
^ Tobacco: burning, tar smell

Microbiological odors:
Microbial growth supported by warm temperatures and moisture may occur on:
^ Foam Seals: musty, mildew smell
^ Rubber Seals: musty, mildew smell
^ Adhesives: musty, mildew smell
^ Standing Water: musty, mildew smell
^ Water Soaked Carpet/Trim: musty, mildew smell

Human and other interior-generated odors:
^ Secretion From The Human Body: body odors
^ Perfuming Agents: sweet or fragrance smell
^ Dirty Clothes, Shoes, Socks: musty, mildew, body odors
^ Food/Beverage: sweet, musty, mildew, fishy smell

The first step in diagnosing an odor concern is to verify the concern. To verify an odor you must determine when and under what circumstances the odor occurs and what type of odor it is.

Chemical odors are usually constant regardless of A/C setting and can be enhanced by A/C system operation. Most chemical odors are caused by fluid leaks and some are caused by improperly cured carpet and trim adhesives or evaporator core coatings.

Environmental odors usually occur for a short time and go away after the vehicle has passed through the affected area. These odors are usually only detected when a window is open or the A/C system is operating in a function that allows outside air to enter the vehicle.

Microbiological odors, if in the A/C system, usually last for about 30 seconds when first turned on and will be detected in both Max and Normal A/C. Microbiological odors occurring elsewhere such as from standing water in doors or kick panels or wet carpeting may last indefinitely and will be more intense in Max A/C. Microbiological odors will not occur at temperatures below 50° F (10° C).

Human and other interior-generated odors occur while the source is present and may linger for a short time after removal. These odors can be more noticeable during operation of the A/C system. They can be detected in the outside air position and may be more noticeable in recirculation mode. The first step in getting rid of odors is to find the source of the odor. Once the source is found, it must be removed and the affected area cleaned or treated.

Chemical odors can be removed by repairing or replacing the component that causes the odor and then cleaning any residue that may have accumulated from the component failure.

Environmental odors usually cannot be removed due to the fact that they occur from external sources and are an everyday occurrence. They can, however, be minimized by switching to Max A/C or recirculation mode.

Microbiological odors can be eliminated by removing the source and then treating the affected area. Standing water must be allowed to drain and dry out. A/C systems may be treated by using Motorcraft A/C Cooling Coil Coating (YN-29), or equivalent meeting Ford specification (WSS-M99B187-A) as described in the Service Procedure in this article.

Human and other interior-generated odors can be eliminated by removing the source and cleaning the affected area.

A/C Odor Treatment Procedure
1. Try to reasonably rule out any other source for the odor. Check the carpet on the passenger side for signs of being wet. Continue diagnosis if water is found on carpet and repair as needed. Check the blower motor and cover for signs of moisture. This may be as a result of water bypassing the cowl baffling system that prevents rain intrusion.

2. Remove the engine side fasteners for the plenum cover. This will allow access to the Cowl Top Panel - Water RH. Remove this and inspect the air inlet screen. Use a shop vacuum if there is debris present. This debris may work its way into the evaporator case and act as food for the microbes to grow. Re-install the cowl components.

3. Check to see that the evaporator drain tube (or hose) is not plugged or restricted by debris. Clear anything that may be obstructing the drainage of water.

4. Open vehicle windows.

5. Disconnect A/C cycling switch electrical connector.

6. Set the following:
^ Function selector switch in A/C mode
^ Temperature at full heat Blower at high speed
^ Engine running at normal operating temperature

7. Run vehicle (Steps 4-6 conditions) for 25 minutes. This will dry out the system.

8. Turn ignition off.

9. Disconnect and remove the blower motor and blower motor resistor by referring to Workshop Manual, Section 412-02 - Blower Motor. (This provides ease of access to the evaporator core and eliminates the possibility of contaminating the blower motor and/or blower motor resister with the Motorcraft A/C Cooling Coil Coating.)
NOTE
TO AVOID ANY POSSIBLE DAMAGE, DO NOT SPILL OR SPRAY THIS PRODUCT ON ANY INTERIOR SURFACE (E.G., INSTRUMENT PANEL) OR MATERIAL (E.G., CARPETING).

10. Add the full four (4) fluid ounces (1 bottle) of Motorcraft A/C Cooling Coil Coating (YN-29) to the Rotunda A/C Disodorizer Sprayer (Rotunda 164-R4700). For effective treatment, use the full four (4) fluid ounces on one vehicle application. Insert the A/C Disodorizer sprayer nozzle into the opening in the evaporator case and direct toward the face of the evaporator core. Spray Motorcraft A/C Cooling Coil Coating until empty.

11. Reinstall and reconnect blower motor resistor and blower motor.

12. Repeat Steps 6, 7, and 8 to cure the Cooling Coil Coating.

13. Reconnect A/C cycling switch.

Air Inlet Vacuum Motor Bleed Valve Tee Installation
1. Remove the passenger front air bag. Refer to Workshop Manual Section 501-20B for procedure.

2. Disconnect vacuum line at air inlet door vacuum motor. Install bleed valve tee Part Number 3L8Z-19B888-AA into vacuum line 90 degree connector, and attach vacuum line with the vacuum bleed tee to air inlet door vacuum motor. Refer to Workshop Manual Section 412-04 (Vacuum Control Motor - Outside Air Inlet) for component location.

3. Follow Workshop Manual procedures for reinstalling passenger front air bag.
 

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Don't forget to add the cabin filter too. That is money well spent. An auto ionic breeze helps a lot also.
 

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Discussion Starter · #3 ·
(click on thumbnails to enlarge)

07-002/03

2001-2003 TRIBUTE

MUSTY / MILDEW ODOR FROM CLIMATE CONTROL SYSTEM

APPLICABLE MODEL(S)/VINS
2001 - 2003 Tribute

DESCRIPTION
Some vehicles may exhibit a musty and/or mildew-type odor coming from the climate control system. This odor may be caused by mildew-type fungi in the A/C evaporator. It is most noticeable when the A/C is first turned on.

To help reduce odors:
^ Apply Mazda Air Cooling Coil Coating to the A/C system, which encapsulates the mildew.

^ Install air inlet vacuum motor bleed valve, which operates the recirculation/fresh air door to default to fresh mode when the vehicle is parked to dry out the evaporator core.

Customers having this concern should have their vehicles serviced using the following repair procedure.

REPAIR PROCEDURE
1. Verify customer concern.

2. Try to reasonably rule out any other source for the odor.
^ Check the carpet on the passenger side for signs of being wet. Continue diagnosis if water is found on carpet and repair as needed.
^ Check the blower motor and the cover for signs of moisture. This may be a result of water bypassing the cowl baffling system that prevents rain intrusion.

3. Remove the engine side fasteners for the plenum cover. This will allow access to the cowl top panel-water RH.
a. Remove and inspect the air inlet screen.
b. Use a shop vacuum if there is debris present.
Note:
This debris may work its way in to the evaporator case and act as food for the microbes to grow.
c. Re-install the cowl components.

4. Check to see that the evaporator drain tube (or hose) is not plugged or restricted by debris. Clear anything that may be obstructing the drainage of water.

5. Disconnect A/C cycling switch electrical connector.

6. Start engine.
WARNING:
Running the engine inside an enclosed area, such as garage, is dangerous. Exhaust gas, which contains poisonous carbon monoxide, could easily enter the cabin. Loss of consciousness or even death could occur. Don't run the engine when inside an enclosed area.

7. Open vehicle windows.

8. Set the following:
^ Function selector switch in the Max A/C mode
^ Temperature at full heat
^ Blower at high speed
^ Engine running at normal operating temperature


9. Run engine in this condition for twenty-five minutes. This will dry out the system.

10. Turn ignition off.

11. Disconnect and remove the blower motor and blower motor resistor according to Workshop Manual (section 07-40 CONTROL SYSTEM - BLOWER MOTOR) (This provides ease of access to the evaporator core and eliminates the possibility of contaminating the blower motor and/or blower motor resistor with Mazda A/C Cooling Coil Coating.)

12. Shake the bottle of Mazda A/C cooling coil coating well (P/N 0000-77-570K-01) and attach it to applicator.
NOTE:
To avoid any possible damage, do not spill or spray this product on any interior surface (e.g. instrument panel) or material (e.g. carpeting).

13. Connect applicator to compressed air. For effective treatment, use the full four (4) fluid ounces on one vehicle application.

14. Insert applicator in opening of evaporator case and directly spray toward face of the evaporator core. Spray until bottle is empty, ensuring the entire core is coated.


15. Re-install blower motor resistor and blower motor immediately.

16. Repeat steps 7-10 to cure product.

17. Re-connect the A/C cycling switch connector.
AIR INLET VACUUM MOTOR BLEED VALVE TEE INSTALLATION

18. Remove the front passenger-side air bag according to Workshop Manual (section 08-10) PASSENGER AIR BAG MODULE.

19. Disconnect vacuum line at air inlet door vacuum motor.


20. Install bleed valve tee (P/N EC01-61-2E0) into line 90 degree connector, and attach vacuum line with the vacuum bleed tee to air inlet door vacuum motor according to Workshop Manual (section 07-40) VACUUM CONTROL MOTOR - OUTSIDE AIR INLET.


21. Re-install the front passenger-side air bag according to Workshop Manual (section 08-10) PASSENGER AIR BAG MODULE.

22. Verify repair.

PART(S) INFORMATION
EC01-61-2E0 - Switch Assembly (Vacuum Bleed Valve Tee) - Qty. 1
0000-77-570K-01 - Mazda Air Cooling Coil Coating Kit - Qty. 1 - Includes applicator, pressure regulator, and 4 bottles of Mazda Air Cooling Coil Coating 118 ml (4 fl oz)
0000-77-550E-01 - Mazda Air Cooling Coil Coating - Qty. 1 - Replacement bottles 118 ml (4 fl oz), requires one bottle per vehicle

WARRANTY INFORMATION
Warranty Type: A
Symptom Code: A5
Damage Code: AG
Part Number Main Cause: SEE PART(S) INFORMATION
Quantity: 1
Operation Number / Labor Hours: YY324XRX / 1.5

NOTE:
This information applies to verified customer complaints on vehicles covered under normal warranty. Refer to the SRT microfiche for warranty term information.
 
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